Telegraphic progressive printing system



June 6, 1967 E. E. KLEINSCHMIDT ETAL 'TELEGRAPHIC PROGRESSIVE PRINTINGSYSTEM 6 Sheets-Sheet 1 Filed May 6, 1963 INVENTORS EDWARD E.-KLEJNSCHMDT WLBURN F. BRADBUKY KURT TAUBMANN June 1967 E. E.KLEINSCHMIDT ETAL 3,324,240

TELEGRAPHIC PROGRESSIVE PRINTING SYSTEM 6 Sheets-Sheet 2 Filed May 6,1963 T SD MWY 9 w. THR M V L S M .F E M N T 4? mm? wmm ww START MAG-PRINTER PRINTER PRINT Much PRNTER June 6, 1967 E. E. KLEINSCHMIDT' ETAL3,324,240

TELEGRAPHIC PROGRESSIVE PRINTING SYSTEM Filed May 6, 1963 6 Sheets-Sheet3 new mp 39 22 INVENTORS EDWARD E. KLEmscHMm-r WILBURN F. BRADBUZY KURTTAUBMANN June 6, 1967 E. E. KLEINSCHMIDT ETAL.

TELEGRAPHIC PROGRESSIVE PRINTING SYSTEM Filed May 6, 1965 I00K 0 s 77'92 9 73 P 74 94 I Z 6 Sheets-Sheet 4 MATRIX LINES "7 $TART CAR. RETURN57 e. LINE. FEE-D 4 9 STOP ""1 GROUP 7 INVENTORS v EDWARD E.KLEINSCHMIDT WILBURN F. BRADBURY KURT TAUBMANN June 6, 1967 Filed May 6,1963 PER COMM UTATO R L E. E. KLEINSCHMIDT ETAL 3,324,240

TELEGRAPHIC PROGRESSIVE PRINTING SYSTEM 6 Sheets-Sheet 5 INVENTORSEDWARD f. KLE/NSCHM/OT W/LBURN F. BRAD8URY KURT TAUBMAN BY samumc As W,W v Zale/ J, WW

June 6, 1967 E. E. KLEINSCHMIDT ETAL 3,324,240

I TELEGRAPHIC PROGRESSIVE PRiNTING SYSTEM Filed May 6, 1963 6Sheets-Sheet 6 SiGNAL +1.oY.D- (zov. 0.0.)

INVENTORS' EDWARD E- KLEJNSCHMID'T WILBURN F. BRADBURY KURT TAUBMANNUnited States Patent 3,324,240 TELEGRAPHIC PROGRESSIVE PRINTING SYSTEMEdward E. Kleinschmidt, Miami Beach, Fla., and Wilburn F. Bradbnry,Northbrook, and Kurt Taubmann, Lake Forest, IiL, assignors to SCMCorporation, New York, N.Y., a corporation of New York Filed May 6,1963, Ser. No. 278,241 26 Claims. (Cl. 178-25) This invention pertainsto automatic telegraphic systems and apparatus and more particularly tosystems whereby transmitted logic is printed in directly legible symbolsrepresentative of characters of a language as well as special codes ortelegraphic codes. Each symbol is progressively formed by a plurality ofprinting operations and will be referred to as telegraph progressivesymbol printmg.

The transmitting and receiving apparatus of this present invention isespecially useful in conjunction with radio signaling systems as well asthe usual telegraphic signaling channels. The invention does not usetype, rather it specifically pertains to that form of telegraphicsystems wherein each character or symbol is divided into a predeterminednumber of units, transmitted as such, received and progressively printedin a predetermined time-space pattern on a full page of paper (ratherthan on tape) until a representation of the character being transmittedhas been formed thereon. It is not a facsimile system per se in thatpre-scanning of a symbol is not utilized.

In previously known facsimile apparatus, the paper was movedcontinuously at a specific speed as was the printing mechanism and incertain models this relationship caused the printed matter to trail 01ftoward the lower edge of the paper. Later modifications had the printingmechanism mounted angularly canted in respect to the continuous movementof the paper but difficulty was still encountered in synchronizing theprinting speed with the containuously moving paper and therefore theprinted matter still had a tendency to frequently trail off in an upwardor downward slant. Thus, an acceptable, easily read copy was stilldiflicult to obtain without constant readjusting of the receivermechanism and controls.

In the present invention no definite code is used, no pre-scanning isnecessary and the transmitted signals from an electronic keyboard comein on the line to the receiver and are printed directly on the paper.The incoming signal [which in the exemplary embodiment includesfortyeight (48) units] pulses -a hammer magnet and the print hammerstrikes the paper through an inked ribbon and prints small dots in apredetermined order to form specific symbols or characters on the papercorresponding to specific signals. By using a stopstart principle, eachletter is printed in its own prescribed area in straight lines acrossthe page as occurs with a standard typewriter. This invention alsoincorporates standard functions similar to those which are basic totelegraph printers, e.g., carriage return, line feed and automaticend-ofline carriage return and line feed.

The system and components of the present invention will satisfy a demandfor inexpensive telegraphic systems capable of satisfactorily utilizingvoice frequency installations, e. g., telephone or radio. Because itssignals have 48 pulse points and thirty-five of those are used in theprocess of forming each symbol or letter character, interruption bynormal static pulses should not completely obliterate the unit symbol orcause a wrong symbol to be printed. Such a system can beextremely'useful to provide a small, page message, reproducer for policeor military vehicles or the like. Furthermore, any type of letter orfigure and most other symbols can be printed on a standardized receivermerely by rearranging the unit pulses in each signal in a desiredpattern.

Accordingly, a primary object of this invention resides in the provisionof a novel receiver for making a printed record on a page of paper, eachcharacter or figure or other symbol being composed of a series of unitsor dots originated in a predetermined order by a diode matrix system orsimilar systems in a signal originating and transmitting unit.

Still another object resides in the provision of a novel synchronizationmethod for a telegraphic progressive printing system wherein the speedof the receiver is independent of the speed of the transmitter and canbe adjusted without any interference with the speed or operation of thetransmitter by an operator as he makesvisual observation of the printedimage, thus eliminating the need for synchronization pulses in thetransmitted signals.

A further object resides in the provision of a novel telegraphprogressive print receiving apparatus capable of recording logic innon-sloping, single lines (i.e., lines which pass straight across therecord as in -a conventional typewriter) and without the necessity ofprinting duplicate or fractional characters in order to assure recordingthe features of a complete line of type as was necessary in manypreviously known facsimile recorders.

Still another object resides in the provision of a novel telegraphprogressive print receiver capable of immediate recordation of legiblecharacters or symbols as signals are received and without the necessityof using photographic development or chemically prepared materials.

Another object resides in the provision of a novel inexpensivetelegraphic receiver capable of receiving, with recording, foreignlanguages using French characters and also many foreign languages thatdo not use English characters, this being accomplished without the needof any selector mechanisms, conversion devices and complex linkages allof which require delicate adjustment, and are expensive.

Further objects of this invention will become apparent from thefollowing detailed description when read in conjunction with theaccompanying drawings in which:

FIGURE 1 is a perspective drawing of a telegraphic progressive printreceiving unit constructed in accord with this invention, the coverbeing removed to illustrate the working mechanism and the generallocation of the major components;

FIGURE 2 is a reduced size perspective view of a complete keyboardtransmitting unit constructed in accord with the present invention;

FIGURE 3 is a reduced size perspective view of the receiving unit shownin FIGURE 1, in this instance, the cover being included;

FIGURE 4 is a perspective view of a detail portion of the power trainfor the receiving unit, showing the main drive motor and gear train tothe vaned drum;

FIGURE 5 is a detail drawing illustrating the dot construction of theletter E as printed in various configurations depending upon the speedof the receiver in relation to the inter-pulse speed within an incomingmultiple pulse signal;

FIGURE 6 is a cut away perspective view illustrating I the principalcomponents in the keyboard transmitting the key controlled switchingsystem connects to set up the matrix group which in turn connects acurrent source to selected segments of the commutator. A portion of amonitoring receiving printer is also illustrated in this FIGURE 8 is avertical cross-section illustrating the transmitter commutator, itsdrive power input train and its relationship to the transmitterstart-stop magnet;

FIGURES 9-20 are detail views illustrating components in the receiver asfollows:

FIGURE 9 is a detail plan view showing the print hammer assembly and itsrelation to the vaned drum;

FIGURE 10 shows a small detail of the print hammer carriage screw inplan view and illustrates the lower end of the print hammer mechanismrelease lever engaging the stud which cams the lever back intoengagement with the carriage screw;

FIGURE 11 is a front elevation detail view of the print hammer assemblyand the vaned drum, and shows the structure by which the hammer assemblyis attached to the carriage screw;

FIGURE 12 is another front elevation detail showing components omittedfrom FIGURE 11, illustrating the print hammer assembly return spring andthe monorail assembly used to transport the print hammer assembly;

FIGURE 13 illustrates left-hand side details of the print hammerassembly, the monorail carriage and associated operating members, theprint hammer assembly being illustrated as it would be connected to thecarriage screw during normal travel, the carriage return and line feedsolenoid being de-energized;

FIGURE 14 illustrates left-hand side details (as in FIGURE 13) but showsthe carriage return and line feed solenoid in an energized condition andthe print hammer assembly as it would appear during the carriage returncondition;

FIGURE 15 illustrates details which are located on the right-hand sideof the machine and shows the paper feed mechanism in an engagedcondition and also shows the start-stop mechanism in the stop position;

FIGURE 16 is a right-hand detail view similar to FIG- URE 15, showingthe start-stop magnet de-energized, the start-stop mechanism in aneutral position, the paper feed mechanism disengaged and its solenoidde-energized.

FIGURE 17 is a partially sectioned front elevation of the vaned drum andthe manual paper feeding mechanism;

FIGURE 18 is a view similar to FIGURES 15 and 16, showing the startmagnet switch open, the carriage return-line feed switch open and theassociated mechanism in an operative position;

FIGURE 19 is similar to FIGURE 18 and shows the start-stop switchclosed, the start-stop magnet energized and the carriage return-linefeed switch closed;

FIGURE 20 is a view similar to FIGURE 19 with the machine shown in thestop position with the start-stop switch closed, the start-stop magnetenergized and holding, and the carriage return-line feed switch open.This figure also shows the coincidence adjustment mechanism which isused to synchronize the machine with the incoming signal;

FIGURE 21 represents the transmitter commutator in elevation from theleft side (see FIGURE 6), and shows the segments which are Wired fromthe matrix components representing the letter E and also identifies thesegments which control the various functions;

FIGURE 22 is a schematic drawing showing three groups of commutatorsegments: the fifth group, the last group which controls the functionsand the first group;

FIGURE 23 is a schematic layout of the 48 segments of the commutator, aportion of an exemplary diode matrix group and several of the keyswitches. The matrix portion shown is wired to the proper commutatorsegments and to selected key switches to result in transmission of theletters M, H, B, E, S, V and X when the appropriate key switch isclosed;

FIGURE 24 is a block representation of the letters E and K, the shadedsquares being those units which must be printed to effect progressiveprinting of the letter, the shaded squares being numbered in the orderof their progressive recording on the paper;

FIGURE 2 5 is an enlarged plan view of the print hammer assembly;

FIGURE 26 is a schematic wiring diagram for the receiver and includesthe carriage return-line feed operating circuit;

FIGURE 27 is an enlarged view of the vaned drum and the print hammerillustrating their relationship before printing; and

FIGURE 28 is an enlarged view of one drum vane and the hammer bladeillustrating schematically the seven positions on the print hammer whicheffect printing of selected ones of the seven dots in each of the fivevertical rows to result in the letter B.

General operation A basic telegraphic progressive printing system (seeFIGURES 1-3 and 7) includes a transmitter unit 30 (FIGURE 2) and areceiver unit 32 (FIGURES l and 3). Each unit will be connected to apower source (not shown) furnishing electrical power, e.g., volts AC and12 volts DC, for drive power and signal power. The output signal linefrom the transmitter unit can be connected by direct line, e.g., a powercircuit or telephone line, to the input of the receiver unit or by radioequipment through a radio channel. The power supply circuits to thetransmitter unit 30 and the receiver unit 32 are turned on by respectiveON-OFF switches 33 and 34, whereupon the system will be ready foroperation.

In the receiver 32, when switch 34 is on the receiver motor 36 isenergized as is also the receiver start-stop magnet 37 which immediatelyblocks all functioning activities of the receiver 32 until the firstincoming pulses (start pulses) of a transmitted character signal arereceived from transmitter 30 as will be explained in greater detailhereinafter.

The receiver 32 now is ready to receive the first of the incoming pulsesof a signal which will occur when a key on the transmitter unit keyboard39 is depressed. Referring to FIGURE 7, when a key 38 is depressed itwill move down along vertical guide slots in a comb 40, also beingguided in a pantograph manner by two pivoted levers 41 and 42. The keyunit is moved downwardly against the biasing force of a spring 43 whichis connected to a lug on the lower lever 42, and urges the keypantograph unit in a CW direction. When released, the key 38 returnsunder spring 'bias to its normal position whereat a lower key lug abutsa bumper strip 44, made of a material such as felt, cork, rubber or foamplastic.

When the key is depressed and the lower lever 42 of the pantographlinkage for key 38 moves CCW against the force of spring 43, itsprojected right-hand lever arm 46 pushes upward against one arm of anassociated switch operator lever 47 causing the lever to rotate CW, so asecond arm 48 of the operator lever in turn will engage and cause twoassociated leaf switches 49 and 50 to close in respective, sequentialorder although closure is almost simultaneous. The first (upper) switch49 closes a circuit to a diode matrix bank 51, setting up apredetermined circuit through selected diodes in accord with the keywhich was depressed. The second switch 50 closes a circuit to thetransmitter starting mechanism which will be discussed hereinafter.

The diode matrix bank 51 in the transmitter unit can be wired to formcharacters of any language using English letters and many other foreignlanguage characters and symbols, so long as they can be formed withinthe established limits of the squares in the symbol blocks as shown inFIGURE 24. If desired, these limits can, of course, be expanded bymaking certain changes and modifications in the exemplary mechanisms andcircuits and will fall within the confines of this present invention.

The various symbol keys on the keyboard are similar and each willoperate two leaf switch units, the first of which in each case connectsa circuit to a desired specific matrix diode pattern associated with thespecific key and the second of which energizes the transmitter startmagnet. In addition to the keyboard, transmitter 30 incorporates a motordriven commutator, by which the key selected matrix diode circuits areenergized in a predetermined order and timed relationship, and acommutator start-stop magnet and mechanism.

The transmitter commutator 52 can be seen in FIG- URES 6, 7 and 8 (it isalso represented in FIGURE 23) and, in the exemplary embodiment hereindescribed, consists of forty-eight individual stationary segments 53arranged in a ring on a dielectric base 80 and having no electricalconnection between each other. If more complex characters or morefunctions are needed, or if more time were needed to accomplish theexisting functions, additional segments 53 may be added to thecommutator. Each segment 53 of commutator 52 is directly connected viaan individual line 54 to the diode matrix bank 51 (only one line 54being depicted in FIGURE 7). The connections will be explained in moredetail hereinafter with reference to FIGURE 23.

After the first switch 49, the matrix switch, associated with adepressed key is closed and has set up the desired diode pattern in thematrix bank 51, the second switch 50 is closed and completes a circuitsending current through a one-shot multivibrator 55 (FIGURE 7) to atransmitter starting magnet 56, which, when energized,

attracts the armature 57 shown in FIGURE 6, moving it in a CCW directionuntil its blocking end 58 moves out the path of a commutator shaftblocking lever 59. With the blocking armature removed from its path,blocking lever 59 and commutator shaft 60 will start rotating due todrive force transmitted through a slip clutch 61 which includes a gear62 driven by a worm 63 rotated directly from the transmitter motor 64.

Attached to the right end of and rotating with the commutator shaft 60is a wiper arm 65 which in turn is fixed to a wiper disc 66 alsorotating with shaft 60. Working in sliding contact relationship with therotational wiper disc 66 is a brush contact 67 (FIGURES 7 and 8). It isthrough this brush contact 67 that electrical pulses are sent over anoutput line to the transmitter amplifier 68. The amplified pulses aresent out over the telegraphic network to the aforedescribed receiverstartstop magnet 37 and thence on into the coil of the print hammeroperating magnet 69 after certain switching operations have beenperformed which will be explained later in the text. Note, therotational speed of the segment wiper 65 is such that it will make acomplete rotation before the key operated matrix switch can open uponrelease of the depressed key.

The basic signal for the system is a character or symbol block made upof forty-eight individual pulse units which, for convenience, can bereferred to as mark or space. Each pulse unit corresponds to a segment53 of the commutator 52. Shown in FIGURE 24, the signal pulse units arearranged in six vertical rows of eight pulse positions or squares in arectangular block. Thirty-five squares (or pulse units) of the signalblock are used to form the actual character or symbol while theremaining thirteen squares are used in the performance of or to effectthe various functions such as character spacing, line feed, carriagereturn, stop and start. This is more clearly illustrated in FIGURE 22where each numbered commutator segment corresponds to the same number inthe squares of the character or symbol block (FIGURE 24).

As stated hereinbefore, the diodes in the matrix bank 51 are wired toset up circuits to the appropriate commutator segments for desiredcharacters and symbols in accord with a depressed key and each of thesecharacters will be printed on a page of paper '70 in one or moreprinting sequences passing down from square to square from the top tobottom of each vertical row starting in the first row in a characterblock progressing through the 6 first five rows from left to right.This, too, will be more fully explained hereinafter.

Receiver After the transmit starting magnet 56 is energized to unblockthe commutator shaft 60, the wiper arm 65 begins to move around theinside of the commutator 52 (see FIGURE 21). During initial movement thewiper arm 65 moves off of the stop segment #41 (see FIG- URE 23), whichhas a positive signal potential applied thereto, and moved on to thedead start segments #42 and #43. Since the wiper is connected to thetransmitter output thesignal will commence with two space or nocurrentpulses and power is instantly removed from the receiver start-stopmagnet 37. The receiver stop lever 72 (FIGURES 18, 19 and 20) willimmediately pivot CW on its pivot pin 73, under bias force of a spring74 so its blocking arm 75 will instantly move out of the path of a stopcam 76 on the receiver function shaft.

During this time, the receiver motor 36 is, of course, running andtransmitting drive power through a worm 78 to a worm wheel 79 secured ona transfer shaft 80 (FIGURE 4). On the opposite end of transfer shaft 80is a gear 81 meshed with a larger gear 82 which is part of a slip clutch84. By means of the gearing described, rotational power is transmittedto a vaned drum 86 which, like the driven components of slip clutch 84,is non-rotatably attached to the function shaft 87.

On the opposite end of the receiver unit drum shaft 87 is securedanother large gear 88 (see FIGURES 1 and 11) which is meshed with asmall gear 90 in a 4:1 ratio. Gear 90 is non-rotatably fixed on acarriage screw 92 and imparts rotational movement thereto (see FIGURES15 through 20) whenever the drum shaft 87 rotates. By ap propriatetiming, the time period for a complete signal cycle is made equal to aone-fourth revolution of the drum shaft 87 and therefore, when gear 88makes a one-fourth revolution, the carriage screw gear 90' and of coursethe carriage screw 92 itself will make one complete revolution. If nofurther logic is transmitted, the drum shaft 87, gear 88, gear 90 andcarriage screw 92 will be blocked at the end of the signal cycle by thestart stop magnet stop lever 72 in a manner as will now be described.

Referring to FIGURE 20, the receiver start-stop magnet 37 is illustratedin an energized condition, which pulls the stop lever 72 CCW and holdsit withits blocking lug 75 positioned in the path of rotation of drumshaft stop arm 76. This stops the rotation of the drum and the carriagescrew 92 and thus prevents the receiver 32 from further printing cycleoperations. During periods when no logic is being transmitted, thisreceiver stop condition will be maintained because current is beingchannelled through the stop segment of the commutator 52, through thecontacts 94 of a DPST switch 96 and from there to the receiverstart-stop magnet 37. The start of transmission of the next character,as has been described 'hereinbefore, causes the transmitter wiper arm 65to move onto the start segments #42 and 43 (FIGURE 21), thereby breakingthe circuit and removing the current How to the receiver start-stopmagnet 37, whereupon the stop lever 72 is released and will immediatelyrotate CW biased by its spring 74.

During the receiver print operation cycle, when the stop lever 72 isreleased as shown in FIGURE 18, and rotates CW, a control edge of a topfinger 77 moves away from abutment with a switch camming button 98 ofDPST switch 96 permitting its movable contact arm 100 to spring in a CWdirection, opening switch contacts 94 in the receiver start-stop magnetcircuit and immediately cutting off the current to the start-stop magnet37. The same movable switch arm 100 simultaneously closes contacts 102to connect the receiver circuit to the print hammer magnet 69 (seeFIGURE 26).

Looking at FIGURE 21, the transmitter wiper arm 65,

continuing its rotational cycle, moves on past the two dead startsegments 42 and 43 and makes contact with the #1 segment of thecommutator. If a potential has been placed on this segment by the matrix51 which has been conditioned by the depressed key, that started thetransmission signal cycle, 'e.g., the #1 segment will be energized inthe case of letter E, the receiver circuit to the print hammer magnet 69is pulsed as the wiper contacts the #1 segment. Such a pulse will occurin a closed circuit from the diode matrix 51 to the #1 segment of thecommutator 52, thence through the wiper arm 65 to the Wiper disc 66,through the brush contact 67 over the communication lines, or network,to the receiver 32 and finally to the print hammer magnet 69. The printmagnet ar-mature 104 (see FIGURE 25) is instantly drawn against theforce of its bias spring 107 in a CW motion until its pole end 106 isfloating in the air gap between core ends 108 and 110 of the printhammer electro-magnet 69. The floating action is a unique feature inthis type of printing mechanism. Note, a sharp impact will occur whenthe print hammer 112 is operated to strike the inked ribbon 114 and therecord paper 70 against a drum vane, yet the gap between magnet coreends 108 and 110 and the armature pole end 106 provide a magnetic fluxresilience which provides freedom to the print hammer enabling it torebound on impact. This relationship eliminates the need for stricttolerances that would otherwise be necessary in the hammer-armaturecombination and also eifectively eliminates the tendency of the printharnmer 112 to cut into the paper 70. To provide an adjustment of thetravel of the print hammer 112 a small hammer abutment limit screw 113is located at the spring biased hammer limit position.

Thus, as a result of a current pulse through the #1 commutator segment,the print hammer armature 104 swings on its pivot 105 toward the printhammer magnet 69, and the thin print hammer head 112 (which may bedesignated as a line-shaped hammer or hammer head), attached to thearmature 104, is moved toward the vaned drum 86. The head 112 firststrikes the inked ribbon 114 and presses it against the paper 70 and thepaper 70, in turn, is pressed against a vane 116 of the vaned drum 86with a resultant printing of a small dot on the paper 70. Eachconsecutive print operation a segment of the commutator 52 is contactedby the wiper arm 65 and, if potential has been supplied to that segmentby the matrix, the completed circuit sends a pulse to the print hammermagnet 69 and the aforedescribed printing operation is repeated until acompleted character, such as shown in FIG- URE 24, is formed. Completecharacter forming by specific timing of the printing of dots will bemore fully described hereinafter with reference to the vanes on thevaned drum 86.

The vaned drum 86 desirably has a small periphery and comprises aflanged core 118, shown in FIGURES 17 and 27, around the periphery ofwhich four equally spaced apart groups of five equally spaced apartvanes 116 have been secured. The core flange may be slotted and thevanes brazed in the slots. Between each group of five vanes 116 there isa blank space 120 which is twice the distance between vanes in a group.Space 120 is provided to accomplish the desirable slight spacing betweenletters, and to provide a non-printing portion of a signal cyclepermitting carriage return, stopping and starting functions of thereceiver 32. Only one group of five vanes is used in conjunction withthe printing of one symbol or character, and since the exemplarymechanism is arranged to provide a physical space between each symbolequal to one of the five vertical rows of blocks in a character signal,the spacing between groups of vanes is double the spacing between vaneswithin a group.

As has been previously described, during a receiver print cycle thevaned drum 86 rotates and the carriage screw 92 also rotates throughgears 88 and 90. Due to rotation of the carriage screw 92, the printhammer carriage 122 will undergo a gradual movement to the rightthroughout a printing cycle and while dots are being printed in theselected squares to form the character represented by the signal whichinitiated the print cycle.

Referring to FIGURES 24, 27 and 28, the first row of the letter E(FIGURE 24) is printed by cooperation between the print hammer head 112and the first vane of a group of vanes 116 (FIGURE 27), the first vanebeing designated by the reference character Z. Through propersynchronization, the first vane Z arrives at the proper position nearthe top of the thin print hammer head 112 (see FIGURE 28) at the preciseinstant that the print hammer magnet 69 is pulsed for the first printeddot at the top of the first row. As shown in FIGURES 27 and 28, any dotrequired in the first row for any symbol or character will be printed onthe Z vane 116 from the top down. In the exemplary letter E, all sevendots in the first row are printed, forming a straight line.

It is here noted that when adjacent segments of the commutator 52 areconsecutively energized, the print hammer head 112 remains pressedagainst the inked ribbon 114 and will tend to draw a line on the paperinstead of printing a row of dots (see FIGURE 5).

When the first vane Z has moved past the print hammer, one sixth of aprint cycle is completed and the carriage screw 92, has rotated onesixth of a revolution moving the print hammer assembly at a constantspeed through one sixth of the width of a block (or the Width of one rowof dots). This increment of travel aligns the print hammer head 112 tostart to print at the top of the second row, of the letter B. Thecommutator wiper arm 65 passing from segment #7 in the first print rowhas moved on to the dead segment #8,, between segments 7 and 8 andthence on to pulse the second row segments #8, #11 and #14 of thecommutator 52 and the print hammer magnet 69 is concurrently pulsedaccording to the energized segments.

The second row of dots will be printed by cooperation between hammerhead 112 and the second of vanes 116 which is designated as Y in FIGURE27. it will not print in the first or extreme top space (see top ofFIGURE 24) because of the dead commutator segment #8,, but it will printdot #8. There will be no printing in the next two squares or spacesbecause the print magnet 69 receives no pulses. Then another dot isprinted in square #11, two more spaces are skipped and finally the dotin square #14 is printed. The print hammer assembly, which is stillbeing constantly moved to the right by the carriage screw, now alignsthe print hammer 112 to print the third row of dots in cooperation withthe third of the group of vanes 116, which is designated by the letter Xin FIGURE 27. The wiper arm 65 makes contact, first with a dead segment#15 and then with matrix conditioned segments #15, #18 and #21 of thecommutator 52, pulsing the print hammer magnet 69 at appropriate timesand the specific dots in the third row are printed in the mannerpreviously described. The wiper arm 65 then contacts a dead segment#22,, and proceeds to pass matrixed conditioned segments #22, #25, and#28, the print hammer magnet 69 being again pulsed at appropriate timesto print the specific dots in the fourth row, this time in cooperationwith the fourth of the group of vanes 116, designated by the letter W.

Finally, the wiper arm 65 contacts the final group of print operatingsegments which have two energized segments #29 and #35 the finalcorresponding portions of the letter E are printed in cooperation withthe fifth and last of the group of vanes 116 which is designated by theletter V.

This will complete the forming of the letter E, it being noted that fivevanes 116 (or one complete group) were used to form the single letter E.Thus, it becomes evident that for every complete revolution of the vaneddrum 86, which has four groups of five vanes, four characters can beformed from printed dots.

assure Clearly depicted in FIGURE 11 (and as will also be apparent inFIGURES 9 and 25), a slight angular bend 134 has been formed in thevertical support plate of the print hammer carriage 122. This places anangular cant on the print hammer head 112 which, in conjunction with theconstant travel of the print hammer head and relative rotation of thevaned drum, will assure that the dots in each row of a character will bevertical. Without canting the print hammer head 112 as shown, allprinted characters would be very noticeably inclined to the left. On theother hand, if it is desired that the vertical aspect of the charactersshould incline or slant to the right, the print hammer could be cantedstill further. Whether or not the vertical alignment is used, thehorizontal aspect, i.e., horizontally parallel points in a letter, willdepend upon achieving synchronization between receiver speed andtransmitter speed, to be hereinafter discussed.

After the wiper 65 has moved off of segment number thirty-five of thecommutator 52, the wiper arm 65 contacts a blank segment 36 andconcurrently the receiver stop lever 72 (see FIGURE 19) is mechanicallycammed CCW to its stop position, i.e., toward the receiver startstopmagnet 37, by a lug 138 on the carriage screw shaft which engages aspring leaf arm 140 on the upper stop lever log 77. The CCW movement ofstop lever 72 causes contacts 94 of the receiver switch 96 to close andcomplete the circuit through the coil of the receiver start-stop magnet37.

Bearing in mind that the mechanical camming action at this instant isstill holding the start-stop switch 96 closed, the commutator wiper arm65 will next contact segment #36, 37 and 38 (the carriage return-linefeed segments) and if current is present on those segments, a circuitthrough a carriage return-line feed switch 142 on the receiver and shownin FIGURES 18, 19 and 20, which has, at this point (FIGURE 19), beenclosed by a lug 232 of a four lobe cam 230 fixed on the function shaft87, will be pulsed. Note that segments #36, 37 and 38 will be energizedif a carriage return function is called for from the keyboardtransmitter 30. Also, if it is desired that the carriage return-linefeed operation be performed automatically, a switch 144 shown in FIGURE12 and to be hereinafter described in further detail, will put theconjoint CR-LF functions into operation. For simplicity, carriage returnand line feed will hereinafter be designated simply as CR and LF.

Print hammer carriage feed and return With reference to FIGURES 11 and12, a print hammer carriage 122 mounts and moves the print hammerassembly from left to right, during each signal cycle, including anyprinting operations, by means of the aforedescribed carriage screw 92 incooperation with a carriage mounted drive lever 145 pivotally secured tothe print hammer carriage 122. The lever 145 is shiftably mounted on thecarriage and is adapted to engage and ride in the threads of thecarriage screw 92. The main body of the carriage 122 is a plate member124 which has an upper portion carrying the print hammer magnet 69 andits armature, a lower portion carrying a guide sleeve 126 slidablydisposed over the carriage screw 92, and a midportion which is securedto a roller suspension plate 128 which mounts three small grooved wheels146, 148 and 150. The three wheels straddle a monorail 152 as shown inFIGURE 12.

Print hammer carriage 122 will move to the right along the monorail 152during the printing operation and when it comes to the end of acompleted printed line, the lower wheel 148 will engage and close theautomatic CR and LF switch 144 (FIGURE 12). Closing of switch 144 sendscurrent to the CR-LF solenoid 130 (FIGURE 13), energizing it and pullingthe solenoid plunger 154 down (see FIGURE 14), which causes a lever 156which is fixedly secured on a pivotally mounted shaft 158 to rock in aCCW direction against the biasing force of a spring 160. Attachedrigidly to the opposite end of the lever shaft 158 is another lever arm162 to which is pivotally fixed a long Wire push rod 164. Rod 164extends forward to a carriage return tripping bail 166 which ispivotally mounted in the receiver frame below the carriage 122 and infront of the carriage drive lever 145. When solenoid operated lever arm162 operatively moves CCW, it shifts the push rod 164 to the right whichpushes the tripping bail 166 causing it to pivot in a CCW direction.Pivoting of trip bail 166 causes the operating bail edge 168 to pushagainst a cam portion 169 of the drive lever 145 causing it to pivot CWon its pivoting pin 172, which removes its upper screw engaging tooth174 from engagement with the carriage screw 92. The drive lever 145includes a detent point 176 which cooperates with a mating detent point178 on a detent lever 180 in a manner enabling the drive lever to bedetained either in or out of engagement with the carriage screw 92. Thedetent lever 180 and drive lever 145 are biased toward each other by aspring 182.

Upon the carriage completing a return movement to the left-hand margin,the drive lever 145 will be pivoted CCW to re-engage the carriage screw.The reset movement is accomplished by an inclined camming edge 184 of acam slide 169 on the lower arm of the lever striking a fixed stud 186,see FIGURE 10. The positive camming engagement between lever 145 andstud 186 over-rides the detent action of detent lever 180. The resetmovement of drive lever 145 is rendered possible, even though the CR-LFsolenoid might be still energized, by a cut-out portion 183 in the lefthand end of the drive lever tripping bail 166, see FIGURE 11. Upon beingreset, the tooth 174 of drive lever once again engages between thethreads of the carriage screw 92 and the print hammer carriage 122 isready to again move the print hammer 112 across another line of the pageas further signals are received.

The power to provide the carriage return function is derived from acoiled tension spring 188, shown in FIG- URE 12, one end of which isanchored to a receiver frame member 190, the other end being secured toa cable 192 which passes over to the left side of the receiver 32,around an idler pulley wheel 194 and back to an anchor lug extension 196on the print hammer carriage plate 124. As the print hammer carriage 122moves to the right under the power of rotating carriage screw 92, itpulls the cable 192 which stretches and stores return power in the coilspring 188. Thus, the instant that drive lever 145 on the print hammercarriage 122 is tripped and released from'the carriage screw 92, thehammer carriage 122 will be snapped back, by the spring 188, to the lefthand, startof-line position.

Automatic line feed Automatic line feed occurs simultaneously with acarriage return operation, whether instigated by a received signal oraccomplished mechanically upon the carriage reaching an end-of-lineposition. In either mode, CR and LP is initiate-d by the same solenoid130.

Referring now to FIGURES l5, l6 and 17, when the CR-LF solenoid 130 ispulsed and its plunger 154 is pulled down, the aforedescribed lever 156(as now viewed by its opposite side) is rotated in a CW direction aroundits pivot 158. A pawl 198, carried on an arm of lever 156, is movedforward and upward, being forced to rotate slightly in a CCW directionby a biasing spring 200 connected between it and the lever 156. Spring200 forces the lower end 202 of the pawl 198 to slide against a guide204 (FIGURE 15 thus restricting the movement of the pawl 198 to a degreethat the toothed end 206 of the pawl will engage a tooth on a line feedratchet wheel 208 and index it only one position or the equivalent ofone line space. A detent 210 for the line feed ratchet 'wheel 208, isprovided to insure against over-traveling more than one line for eachsolenoid operation. After the solenoid 130 is dc-energized, its plunger154 will move upward, the lever 156 will rotate CCW and will reset thepawl 198 into a position from whence it can engage the next tooth of theratchet wheel 208 when the solenoid 130 is again energized.

Turning to FIGURE 17 and with additional reference to FIGURE 1, the linefeed ratchet wheel 208 is nonrotatably fixed to a shaft 212 parallelingand below the drum with one end projected to an exterior location on oneside of the covered receiver 32. A manual operating knob 214 is fixed onthe projected end of the shaft 212 to enable an operator to manuallyturn the shaft 212 for feeding as much paper 70 as desired out of thereceiver 32. Upon rotation of shaft 212 paper record feeding isaccomplished through two gears 216 and 218 non-rotatably secured on theshaft 212 and respectively meshing with two additional gears 220 and 222which are rotatably mounted on the vaned drum shaft 87 adjacent the endsof the vaned drum 86. The rotatably mounted gears 220 and 222 at theends of drum 86 have rubber rims 224 and 226 and pressed against eachrubber rim is a small, spring loaded roller 228, one of which can beseen in FIGURE 11. A roll of record paper 70 is supported at the rear ofthe receiver 32, the paper 70 being fed from the supply roll under thevaned drum 86, up in front of drum 86 and behind the ink ribbon 114,between the two rubber rims 224 and 226 and the two spring loadedrollers 228 and out through the top of the receiver. Thus, when feedshaft 212 is turned, either by the solenoid operated pawl 198 andratchet 208 or by the manual knob 214, record paper 70 will be fed outof the receiver 32.

To accomplish the conjoint CR-LF function as a result of a signal fromthe transmitter keyboard 39, the keyboard includes a key and anassociated dual switch assembly for CR-LF, similar to key 38 andassociated switches 49 and 50 shown in FIGURE 7. Depressing the CR-LFkey will cause the lever 42 for that key to rotate CCW and its end 46causes an associated switch operating lever 47 to rotate CW, closing theassociated first switch 49 (see FIGURE 23) to the diode matrix bank 51.Switch 49', when closed, completes a circuit placing positive potentialon commutator segments #36, #37 and #38, the three segments whichcontrol the CR-LF functions. The second CR-LF key operated switch 50,which is in parallel with all of the second key operated switches 50,(see FIGURE 7) is then closed to start the transmitter wiper arm 65 inthe same manner as hereinbefore described.

Because the CR-LF key operated switches do not control any circuits inthe diode matrix, all of the print operating commutator segments #1-#35will be dead and the transmitter commutator wiper 65 will therefore passover the print segments #1-#35 without effect but when it engagessegment #36, it will close a hot circuit to the receiver CR-LF switch142 shown in FIGURES 18, 19, and 26. The receiver switch 142 is operatedfour times by a cam wheel 230 during each revolution of the receiverdrum shaft 87. The cam wheel 230 is non-rotatably fixed to the drumshaft 87 and is angularly located in synchronization with the vaned drum86 in such a manner as to cause one of the four cam projections 232 toclose the CR-LF switch 142 the instant the last vane 116 of anassociated one of the four groups around the periphery of the vaned drum86 passes beyond the printing range of the print hammer 112. Carnmedclosure of the receiver switch 142, coinciding with the wiper 65contacting the commutator segment #36, completes the circuit between theCR-LF switch on the transmitter keyboard 39 and the receiver 32, thereceiver CR-LF solenoid 130 is energized and the mechanical CR-LFfunctions are accomplished, as has been previously described inconjunction with FIGURES l3, 14, 15 and 16.

In further describing the CR-LF solenoid operation, reference is made tothe FIGURE 26 circuit diagram.

If the receiver stop lever 72 is in the stop position, as shown (same asFIGURE 20), contacts 94 of switch 96 will be closed. If a CR-LF pulse istransmitted it comes in on the signal line 270, through closed contacts94 of switch 96, on through line 272 to the start-stop magnet 37 which,when energized, stops the receiver 32 from printing. Current in line 272is also applied to the CR-LF switch 142, which at this stage is closedby the cam wheel 230, and thence through line 274 to energize the coilof a control relay 276 which has one side connected through line 278 tonegative. Energizing of the control relay 276 is an instantaneous actionwhich would, in itself, not allow enough time for the CR-LF solenoid toeffectively operate. Therefore, a holding coil 280, incorporated withthe control relay 276, will hold the relay contacts 282 closed for alonger period of time, allowing the CR-LF solenoid 130 ample time inwhich to operate effectively. While the holding coil 280 is energizedand is holding the relay contacts 282 in the closed position, current isbuilding up in the holding circuit which includes a capacitor 284 andwill continue to build up until the capacity of the capacitor 284 hasbeen reached. When this point has been reached, the current stopsflowing through capacitor 284, whereupon the holding coil 280 releasesthe relay, its contacts 282 go to normal releasing the CR-LF solenoid130 and simultaneously connecting a resistor 288 across the capacitor.The built-up current in capacitor 284 is dissipated to line 286 throughresistor 288. The three commutator segments #36, #37 and #38 shown inFIGURE 23 are energized on a CR-LF signal to permit sufiicientenergizing time to assure operation of the control relay 276. Likewise,the three segments #39, #40 and #41 are all energized to assureenergizing the receiver start-stop magnet for stopping of the receiver.

As has been hereinbefore described, once the CR-LF solenoid isenergized, the print hammer carriage 122 with the print hammer 112 willbe mechanically shifted back to the left side of the paper 70, the paper70 will have been simultaneously stepped one line space, and thereceiver 32 is in condition to receive the next transmitted signals fromthe keyboard transmitter 30.

Receiver synchronization Throughout the operation, completesynchronization between the keyboard transmitter 30 and the receiver 32must be closely maintained. A signal representing a symbol to betransmitted is originated at the keyboard transmitter 30 by depressing akey 38 which first, instantly sets up a representation of that symbol inthe diode matrix group 51 by placing a potential through predetermineddiodes in the matrix, on selected segments of the transmitter commutator52. This is followed instantaneously by closing the circuit to thetransmit starting solenoid 56 to release and permit rotation of thewiper arm 65. As the wiper arm rotates, the pulses from the matrixselected segments are then transmitted to the print hammer magnet 69 ofthe receiver 32.

If the keyboard transmitter 30 and the receiver 32 are not properlysynchronized, the print hammer 112 and the first vane 116 of a group offive vanes on the vaned drum 86 to be used as the print hammer platenfor the first row of squares of the transmitted symbol, will not be inproper alignment and, consequently, portions of the printed characterswould not be printed. This situation would make the incoming messagevery hard to read if not totally illegible.

In the exemplary embodiment, each character or other symbol is formedwithin the bounds of a block area which is divided into 48 units orsquares, 8 units high and 6 units wide. This arrangement provides anextra vertical row for a blank interval between each letter as well asproviding a extra top line of squares for a blank interval between eachline of print. Thus 35 units or squares of the block area are availablefor forming the actual symbol, 7 units high and units wide. Referring toFIGURE 28, if the first vane of a group of vanes 116 was to rotate toofar past the top edge of the hammer toward the center of the hammer head112 before the print hammer magnet 69 received first row pulses from thecommutator 52 in the keyboard transmitter 30, it could cause the printhammer 112 to record the number one print pulse 234 (FIGURE 24) late,for example, in the print area for the number two pulse. The number twopulse 236 would then fall in the area for the number three pulse 238,number three pulse 238 would fall in the area for the number four pulse248, etc. The number seven pulse 242 would, of course, be printed by thetop of the hammer head 112 on the second vane in the group of vanes 116in the desired blank space 243, at the top of the second row of squarepositions. This pattern would continue throughout the printing of thecharacter which, if it happened to be the letter E, would cause thecomplete lower bar 244 to be lost and printed above the normal characterposition. If this pattern were to continue it is easily seen that anyincoming message could appear somewhat confusing if synchronization werenot immediately adjusted.

Synchronization involves two aspects, (1) position of vane groupsrelative to the complete signal and (2) speed of receiver relative tospeed of transmitter.

Vane position synchronization is an aspect wholly within the receiverand is controlled by an orientation device 246, shown in FIGURE 20, amovable support plate that can be adjustably swung a limited amount CWor CCW around its pivot point which is on the right end of the carriagefeed screw 92. By loosening two clamping screws 248 (which may, ifdesired, have knobs for easy manipulation), the orientation plate 246,when moved to the left for example, within the limits of two arcuateslots 250 in plate 246 causes the stop lever 72 and its pivot pin 73,the start-stop magnet 37 and switch 96 to move with it. The stop lever72 and its blocking arm 75 will thereby be swung CW away from the stopcam 76. As the foregoing direction of adjustment occurs, the slip clutch84 on shaft 87 (FIGURE'4) which carries the vaned drum 86, then causesthe gap or slack to be taken up through a small increment of rotation ofthe gears 88 and 90 (FIGURES 18 and 20) thus keeping the stop cam 76flush against the blocking arm 75 at all times.

The vaned drum 86 being fixed to shaft 87 will rotate as the shaft 87rotates to take up the adjustment gap, thus repositioning the first'vane116 of the first group in a downward direction to be printed onaccordingly in relation to the print hammer 112.

If the orientation plate 246 were moved to the right, the blocking leverarm 75 pushing against the stop cam 76, would force the stop cam,carriage screw and carriage screw gear 90 to rotate CCW. The carriagescrew gear 90, being meshed with gear 88 would rotate function shaftgear 88 CW and it, in turn, being fixed to shaft 87 would rotate theshaft 87 CW, overriding slip clutch 84. This, adjustment operation wouldalso reposition the vanes 116 but moves them up in relation to printhammer 112.

Thus, through the adjustment of the orientation plate 246, the printhammer 112 and the leading vane 116 of any one of the four groups ofvanes around the periphery of the vaned drum 86 can be exactlysynchronized with the incoming start pulses from the keyboardtransmitter 14, and this will inherently adjust and synchronize all fourgroups of vanes.

If tension on the slip clutch 84 would always remain constant, noadjustment of vane position synchronization would probably ever beneeded but, due to the construction of the slip clutch 84, a certainamount of wear is inevitable over long periods of time. So, from time totime, the slip clutch 84 will need adjusting which in turn, will callfor an adjustment of the orientation device 246. The calibrations 251 onthe lower edge of the orientation device 246 aid the operator in makingfiner adjustments.

The second synchronization aspect, speed of the receiver 32, correlatesthe receiver and transmitter and must also be held under close controlso that receiver speed does not vary to any degree with the transmissionspeed of the pulse units within a signal originating from the keyboardtransmitter 38. Receiver operating speed is controlled by a simplerheostat, the control knob 252 of which is seen on the front panel ofthe receiver 32 in FIG- URE 1. The rheostat (not shown) controls thespeed of the receive motor 36 which is a DC, shunt wound motor. This, inturn, through the drive train consisting of worm 78, gears 79 and 81 andthe slip clutch 84, controls the speed of rotation of the vaned drum 86and, of course, all other receiver functions associated therewith.

The operator can tell precisely by visual observation whether or not thereceiver 32 is functioning at a proper speed relative to thetransmission speed within an incoming signal. Turning to FIGURE 5, threerepresentations of a receiver printed letter E are shown, the first is anormal E, that is, it is symmetrically perfect, denoting thatsynchronization of receiver speed is in perfect accord with transmitterspeed. The second fast E denotes that the receiver 32 is running toofast for the incoming pulses in the transmitted signal, consequentlyforming the characters with a distinct upward slant. The third slow E,denotes a receiver 32 is running too slow for the speed of the pulses inthe transmitted signal, thus forming all characters with a distinctdownward slant. In either case, the operator can correct any speeddeviation in the reception by a simple adjustment of the aforementionedspeed control knob 252.

Ink ribbon drive The ink ribbon 114, as shown in FIGURE 1, is driven bya small continuous bead chain 254 which operates between a smallsprocket 256 and a larger sprocket 258, the latter having four times asmany bead sockets as the small sprocket. The small sprocket 256 isattached to a large gear 260 both of which are rotatably mounted on theline feed shaft 212, the gear 268 being rotated by a meshing gear 262which, by virtue of being non-rotatably fixed to the shaft 87, derivesdrive power from the receiver motor 36. The large chain sprocket 258 isfixed to the end of a ribbon drive shaft 264, and because of the 4:1ratio between the bead chain sprockets 256 and 258, the inked ribbon 114will travel very slowly across the printing area and moves only when thedrum shaft 87 is being rotated. The ribbon drive shaft 264, throughassociated gear mechanism, drives either one of the two ink ribbonspools 266 and 268. The gear mechanism is of the reversible type,similar to many mechanisms commonly known and used in the art. Since itsspecific construction is not per se a part of this invention, it willnot be further described.

The invention may be embodied in other specific forms without departingfrom the spirit or essential characteristics thereof. The presentembodiment is therefore to be considered in all respects as illustrativeand not restrictive, the scope of the invention being indicated by theappended claims rather than by the foregoing description, and allchanges which come within the meaning and range of equivalency of theclaims are therefore intended to be embraced therein.

be secured by United 15 der of distinct electrical value pulse unitscorresponding to specific grid block locations in the symbol rectangularspace which, when visually reproduced in a symbol rectangle space on arecord medium, will depict the specific symbol; said receiving recordingunit comprising:

(a) means for receiving said signal;

(b) means for recording, by progressive transcription printing, thesymbol represented by said multiplicity of intermediate intra-signalpulse units of said signal including (1) means actuated by the receivingmeans for causing the initial pulse units of said symbol signal to startthe recording means; and

(c) means comprising portions of said receiving means and portions ofsaid recording means and responsive to said terminating pulse units forstopping said recording means after each symbol recordation so that thebeginning of the recordation of the subsequent received symbolrepresenting signal of at least two successive such signals will beginat a uniform distance from the terminal point of the rectangular spacefor the preceding recorded symbol.

2. A telegraphic progressive symbol printing receiver comprising:transcribing printing means including a plurality of line platen devicesmounted for concurrent rotation about a common axis, marker means, meansfor rotating said plurality of platen devices including means forstarting and stopping rotational movement, means for shifting saidmarker means parallel to the axis of rotation of said line platendevices including means for starting and stopping movement of saidmarker means parallel to the axis of and concurrently with starting andstopping the rotation of said line platen devices, means for causingcooperative relative movement of said marker means and said line platendevices to accomplish coordinated print action therebetween upon arecord medium, and control means having control connections with saidmeans for starting and stopping of the rotation of said platen devicesand of the shifting movement of said marker means respectively at thebeginning and at the end of the electrical pulses contained within areceived symbol signal.

3. A telegraphic progressive symbol receiver as defined in claim 2,wherein said marker means is capable of a multiple number of said printactions as each platen device moves past said marker means, and anadjustable device mounts said means for starting and stopping rotationof said plurality of platen devices to enable selective change of theplaten device start positions relative to said marker device forreceiver orientation to the pulse logic within a received signal.

4. A telegraphic progressive symbol printing page printer comprising: adrum having a plurality of straight line vane platens extending parallelto the axis thereof and each platen having a straight edge positionedradially outward from the axis of said drum; means to rotate said drumabout its axis; a printing member mounted for shifting movement in apath parallel to the axis of said drum adjacent the peripheral path ofsaid platen vanes; means to shift said printing member in the parallelpath with such shifting movement directlyl coordinated with drumrotation; means for moving a sheet of record material between said drumand said printing member and for maintaining the sheet of recordmaterial stationary between said moving drum and moving printing memberduring symbol printing; and signal responsive means for selectivelymoving said printing member, concurrent and coordinated with itsshifting movement and with drum rotation, toward the drum to eifectprinting on the record material.

5. A telegraphic progressive symbol printing page printer as defined inclaim 4, wherein said printing member comprises a magnet armature andsaid signal responsive means comprises an electromagnet and means areprovided whereby said printing member and said electromagnet are mountedfor conjoint shifting movement parallel to the axis of drum rotation.

6. A telegraphic progressive symbol printing page printer comprising: adrum having a plurality of straight line vane platens extending parallelto the axis thereof and with a straight edge positioned radially outwardfrom the axis of said drum; means to rotate said drum about its axis; aprinting member mounted for shifting movement in a path parallel to theaxis of said drum adjacent the peripheral path of said platen vanes;means to shift said printing member in the parallel path with suchshifting movement directly coordinated with drum rotation; means formoving a sheet of record material between said drum and said printingmember; and signal responsive means for selectively moving said printingmember, concurrent and coordinated with its shifting movement and withdrum rotation, toward the drum to eifect printing on the recordmaterial; said printing member comprising a magnet armature and saidsignal responsive means comprising an electromagnet, both of which aremounted by said means to shift said printing member for conjointshifting movement parallel to the axis of drum rotation, saidelectro-magnet having pole faces opposing each other and spaced apart toprovide a fiux gap, and means pivotally mount said printing membermagnet armature relative to said flux gap, so that upon energization ofsaid electromagnet to attract said armature for a printing stroke, saidarmature moves into the flux gap to provide a floating resilience to theprinting member at its impact, position for absorbing rebound forces inthe magnetic lines of flux.

7. A telegraphic progressive symbol printing page printer as defined inclaim 4, wherein said printing member includes a line shaped hammerdisposed transverse to the straight line platens and the logic in thereceived signals enables plural successive hammer print strokes duringthe period when each platen vane rotates past the hammer; said hammerhaving a mechanically variable connection so the exact transverseangular relationship of the line hammer relative to the line platens canbe changed to enable counter control of the lateral inclination of thetranscribed symbols resulting from the concurrent transcriptionmovements of the rotating drum and the shifting hammer member duringsymbol printing.

8. A telegraphic progressive symbol printing page printer comprising: adrum having a plurality of straight line vane platens extending parallelto the axis thereof and with a straight edge positioned radially outwardfrom the axis of said drum; means to rotate said drum about its axis; aprinting member; means to shift said printing member including acarriage device carrying said printing member, mounted for shiftingmovement parallel to the axis of said drum adjacent the peripheral pathof said platen vanes with such shifting movement directly coordinatedwith drum rotation; means for moving a sheet of record material betweensaid drum and said printing member; signal responsive means mounted onsaid carriage means for selectively moving said printing member,concurrent and coordinated with its shifting movement and with drumrotation, toward the drum to effect printing on the record material;said means to shift said printing member includes a spring biased latchmeans on said carriage, a spring biasing means connected to saidcarriage and a rotatable screw connected to rotate with said drum, saidlatch means being biased into engagement with said screw so that screwrotation will move said carriage against spring bias toward anend-of-line position; and means responsive to a special signal conditionto release said latch means from said screw and permit opposite shiftingmovement of said carriage to start-of-line position by said springbiasing means.

9. A telegraphic progressive symbol printing page printer as defined inclaim 8, wherein means are provided to positively reengage said latchmeans with said screw when said carriage reaches a start of lineposition.

10. A telegraphic progressive symbol printing page printer as defined inclaim 8, wherein said means to release said latch means is connected toand actuates said means for moving a sheet of record material each timesaid latch release means responds to a special signal condition.

11. A telegraphic progressive symbol printing receiverprintercomprising: a rotary mechanical printing device; a member cooperatingwith said rotary printing device while shifting parallel with the axisof rotation of said printing device for effecting progressivetranscription printing of characters on a stationary record medium;mechanism for advancing the record medium subsequent to the printing ofa line of characters; and means rendered operable by, and during thefinal shifting movement of, said shifting member for initiating theoperation of said advancing mechanism, operable subsequent to theprogressive printing of a character in response to a received signal.

12. A telegraphic progressive symbol printing receiver for receivingdata information, including symbol signals, on communication circuits,including voice frequency circuits, each signal comprising amultiplicity of selectively spaced sequential pulse units and includinginitiating start and terminating stop pulse units with a multiplicity ofintermediate pulse units equal in number to a predetermined number ofblocks in a block grid arrangement of a symbol rectangle, each specificsymbol to be transmitted comprising a predetermined order of distinctelectrical value pulse units for specific grid blocks in the symbolrectangle which, when visually reproduced in a symbol rectangle space ona record medium, will depict the specific symbol; said receivercomprising:

(a) means adapted to be connected for receiving said signals;

(b) means operable through a cycle in response to each received signalrepresenting a symbol to progressively print portions of said symbol inselected blocks of a grid block arrangement corresponding to thespecific symbol representative pulse units within a signal, until thesymbol is reproduced on a record medium; and

(c) said means to progressively print portions of said symbol includingmeans which automatically initiate progressive printing of individualsymbols representative of successive signals at positions which arecharacter spaced from preceding symbols and printed in a straight lineacross the record medium relative to other symbols in the same line.

13. A page record telegraphic progressive symbol printing receiver asdefined in claim 12 wherein said means for progressively printing saidsymbol further comprises: a rotatable plural line platen drum mountedwith its rotation axis parallel to a line across the page record; arecord feed wheel means rotatably mounted adjacent each end of the drumrotatable relative to said line platen print drum; and feed mechanismcooperating with said record feed wheel means to provide line feed ofthe page record.

14. A telegraphic progressive sym'bol printing receiver as defined inclaim 13, wherein said coaxial feed wheels are friction feed wheels andmeans mount said wheels adjacent the ends of and coaxial with said drum.

15. A telegraphic progressive symbol printing receiver comprising:

(a) a rotatable, plural vaned platen drum;

(b) drive means including a motor and start-stop means connected to saiddrum for selectively rotating said drum;

(c) an electro-magnetically operated print hammer assembly;

(d) a carriage mounting said hammer assembly;

(e) a screw type carriage shifting means including a screw parallel withthe axis of said drum and rotata-ble thereby and releasable means onsaid carriage 18 enabling a drive engagement between said carriage andsaid screw;

(f) means for returning said carriage to start-of-line positionincluding means to store power for said return movement during powerscrew driven movement of said carriage toward the end-of-line position;

(g) means including rotatable coaxial feed wheels rotatable relative tosaid drum and means to step drive said wheels for feeding a sheet recordmedium up between said drum and said hammer assembly;

(h) means responsive to receipt of a signal, which comprises a pluralityof pulse units, for starting a cycle of operation of said start-stopmeans as a result of an initial portion of said plurality of pulseunits, accomplishing a coordinated sequence of relative movement'sbetween said hammer assembly and said drum to scribe a symbolrepresentation on said record medium in accord with a secondintermediate portion of said plurality of pulse units, and to assurestopping of said drum rota-tion due to a third terminating portion ofsaid plurality of pulse units;

(i) said record medium being retained stationary, said print hammerassembly being continuously shifting toward the end-of-line position andsaid drum being continuously rotating during said scribing operation ofa symbol intermediate the start and stop pulse units of a signal; and

(j) control means including a holding circuit device for actuating saidreleasable carriage return drive engagement means and simultaneouslyactuating said means to step drive said feed wheels to feed said recordmedium one step, responsive to a fourth portion of said plurality ofpulse units in a signal and to said carriage reaching an end-of-lineposition for accomplishing automatic carriage return and line feed.

16. A telegraphic progressive symbol printing receiver as defined inclaim 15, wherein said holding circuit device includes an R-C circuitthe capacitance of which provides a timed holding action and saidholding circuit including a switch means actuated upon termination ofholding action to couple the R-C circuit resistance to the capacitancefor dissipating the capacitance.

17. A telegraphic progressive symbol printing receiver comprising:

(a) a rotatable, plural vaned platen drum;

(b) drive means including a motor and start-stop means connected to saiddrum for selectively rota-ting said drum; an electro-rnagneticallyoperated print hammer assembly;

(c) means for feeding a sheet record medium up between said drum andsaid hammer assembly; and

(d) means responsive to receipt of a signal, which comprises a pluralityof plus units, for starting a cycle of operation of said start-stopmeans as a result of an initial portion of said plurality of pulseunits, accomplishing a coordinated sequence of relative movementsbetween said hammer assembly and said'drum to scribe a symbolrepresentation on said record medium in accord with a secondintermediate portion of said plurality of pulse units, and to assurestopping of said drum rotation due to a third terminating portion ofsaid plurality of pulse units;

(e) the record medium being retained stationary by said feed means, saidprint hammer assembly being continuously shifting toward the end-of-lineposition and said drum being continuously rotating during said scribingoperation of a symbol intermediate the start and stop pulse units of asignal.

18. A telegraphic progressive symbol printing receiver as defined inclaim 17, wherein said means to assure stopping of drum rotationincludes means responsive to drum rotational position providing anarming control, rendered operable after starting said drum, permittingstopping of 19" said drum rotation only by the final portion of pulseuni-ts of a received signal.

19. A telegraphic progressive symbol printing receiver as defined inclaim 18, wherein said plural vaned platen drum includes groups ofplatens, all groups being equally spaced apart circumferentially aroundthe drum and one of said groups rotating past the print hammer assemblyduring the drum rotation occurring between the start portion of a signaland the stop portion of the same signal; and said means which isresponsive to drum rotational position and provides an arming controlincludes at least one operator connected to said drum and movable in afixed path during drum rotation so that a said operator moving alongsaid fixed path intersects a fixed location once each time one of saidgroups of platen vanes has moved past said print hammer assembly, and adrum stop circuit control device actuated each time a said operatormoves into said fixed location.

20. A telegraphic progressive symbol printing receiver comprising:

(a) a rotatable, plural vaned platen drum;

(b) drive means including a motor and start-stop means connected to saiddrum for selectively rotating said drum;

(c) a print hammer assembly;

(d) means operatively associating said drum and said hammer assembly,adapted, in response to receipt of a signal, which comprises a pluralityof pulse units, to accomplish a coordinated sequence of relativemovements between said hammer assembly and said drum to progressivelyscribe a symbol representation on said record medium in accord with anintermediate portion of said plurality of pulse units;

(e) record feed means including rotatable coaxial record feed wheel ateach end of said drum and selectively controlled means to step drivesaid wheels for feeding a sheet record medium up between said drum andsaid hammer assembly and otherwise maintain the record medium stationarywhile said drum is rotated during said scribing operation of a symbol.

21. A progressive symbol printing recording device for receiving datacommunication signals, each of which consists of a multiplicity of pulseunits at least part of which may represent print points of a symbol,comprising:

(a) a plurality of lateral line platen means and an upright line hammerdevice shiftable in paths substantially normal to each other only duringthe period when a signal is received, each of said plurality of lineplaten means and said hammer being capable of a plurality of relativemovements toward each other during reception of a signal;

(1)) power drive means, including starting and stopping means and meansconnected to power drive said platen means and said hammer means at aconstant speed rate and also including means to variably adjust saidconstant speed rate, and

() adjustable means, interconnecting said starting means, said stoppingmeans and said means connected to drive said platen, enabling adjustmentof orientation of the means to start the recording means with therelative positions of said platen means and said hammer means.

22. A telegraphic progressive symbol printing receiving printercomprising:

(a) a rotatable drum shaped device with elongate line platen meansmounted exteriorly around the drum axis and extending from one end ofthe drum device to its other end;

(b) means for driving said rotatable drum device including start-stopcontrol means; a print hammer means including a magnetically operablehammer device with a line shaped hammer head disposed transverse to thedirection of extension of said platen means and adjacent the rotatablepath of the platen means, and an electro-magnet adapted to actuate saidhammer device toward the peripheral platen means;

(c) means mounting said print hammer means for shifting movement in adirection parallel to the axis of said drum;

((1) means coupled between said hammer means and said drum driving meansto directly coordinate rotation of said drum device with and causedriven shifting movement of said hammer means in one direction;

(e) means enabling disposition of a record means between said hammermeans and said drum device; and means for receiving a signal, whichcomprises at least one start pulse unit, a plurality of symbol pulseunits and at least one stop pulse unit, responsive to a signal startpulse unit to initiate starting action of said start-stop means,responsive to symbol pulse units to energize said electro-magnet atprogressive predetermined time increments representative of the specificsymbol to cause magnetic force on said hammer device urging said hammerhead to press the record means, during said predetermined timeincrements, against predetermined successive ones of said platen stripsto thereby progressively inscribe a symbol on the record means, andresponsive to the signal stop pulse unit to stop drive rotation of saiddrum.

23. A telegraphic progressive symbol printing receiving printer asdefined in claim 22 wherein an inking device is disposed between saidhammer and said platen means.

24. A telegraphic progressive symbol printing receiving printercomprising: a rotatable drum shaped device with elongate line platenmeans mounted exteriorly around the drum axis and extending from one endof the drum device to its other end; means for driving said rotatabledrum device including start-stop control means; a print hammer meansincluding a magnetically operable hammer device with a line-shapedhammer head disposed transverse to the direction of extension of saidplaten means and adjacent the rotatable path of the platen means, and anelectro-magnet adapted to actuate said hammer device toward theperipheral platen means; means mounting said print hammer means forshifting movement in a direction parallel to the axis of said drum;means coupled between said hammer means and said drum driving means todirectly coordinate rotation of said drum device with and cause drivenshifting movement of said hammer means in one direction; means to shiftsaid hammer means in the opposite direction to said driven shiftingmovement; means enabling disposition of a record means between saidhammer means and said drum device; means for receiving a signal, whichcomprises at least one start pulse unit, a plurality of symbol pulseunits and at least one stop pulse unit, responsive to a signal startpulse unit to initiate starting action of said start-stop means,responsive to symbol pulse units to energize said electro-magnet atprogressive predetermined time increments representative of the specificsymbol to cause magnetic force on said hammer device urging said hammerhead to press the record means, during said predetermined timeincrements, against predetermined successive ones of said platen stripsto thereby progressively inscribe a symbol on the record means, andresponsive to the signal stop pulse unit to stop drive rotation of saiddrum; and means responsive to a special pulse unit originated in asignal subsequent to receipt of all printing pulse units and responsiveto a special signal to actuate said means for shifting said hammer meansin its opposite direction.

25. A telegraphic progressive symbol printing receiving printercomprising:

(a) a rotatable drum shaped device with elongate line platen meansmounted exteriorly around the drum axis and extending from one end ofthe drum device to its other end;

(b) a print hammer means including a magnetically operable hammer devicewith a line shaped hammer head disposed transverse to the direction ofextension of said platen means and adjacent the rotatable path of theplaten means, and an electro-magnet adapted to actuate said hammerdevice toward the peripheral platen means; 7

() means mounting said print hammer means for shifting movement in adirection parallel to the axis of said drum;

(d) means for receiving a signal, which comprises at least one startpulse unit, a plurality of symbol pulse units and at least one stoppulse uni-t, responsive to a'signal start pulse unit to initiatestarting action of said start-stop means, responsive to symbol pulseunits to energize said electro-magnet at progressive predetermined timeincrements represenat-ive of the specific symbol to cause magnetic forceon said hammer device urging said hammer head to press a record means,during said predetermined time increments against predeterminedsuccessive ones of said platen strips to thereby progressively inscribea symbol on the record means.

26. For use in combination with a transcription telegraph system forsymbol signal transmission, a transcribing receiver having a drivenprinting mechanism to progressively inscribe a symbol by a group ofintrasignal pulse unit current condition signals, a point printingoperating electro magnet device, with a line shaped electro-magnetoperated printing hammer, for receiving and accomplishing symbolprinting responsive to the symbol portions of said signals, a cyclingstart-stop device including a stop magnet for said printing mechanism,said startstop device being operable but once for each completeinscribed symbol, and means including said stop magnet to start sa-idstart-stop device upon reception of an initial no-current pulse unit ofa signal, to enable operation of said point printing operatingelectro-magnet device during and responsive to intermediate currentpulse units of said signal and to cause the stop operation of saidstart-stop device responsive to a current pulse unit of said signal onlysubsequent to a predetermined operating period of said driven printingmechanism.

References Cited UNITED STATES PATENTS 2,658,106 11/1953 Hell 178302,659,652 11/1953 Thompson 17830 2,898,175 8/1959 Rice et a1. 346- NEILC. READ, Primary Examiner.

THOMAS A. ROBINSON, THOMAS E. HABECKER, Examiners.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No.3,324,240

Edward E. Kleinschmidt et a1.

June 6, 1967 ied that error appears in the above numbered pat- It ishereby certif n and that the said Letters Patent should read as entrequiring correctio corrected below.

line 39, for "containuously" read continuously Column 1,

line 33, for "French" read English column 2,

Signed and sealed this 28th day of November 1967a (SEAL) JKttest:

E[WVABI)J.IHIENPHH1 Edward M. Fletcher, Jr.

Commissioner of Patents Attesting Officer

1. A RECEIVING RECORDING UNIT FOR USE WITH A TELEGRAPH SYSTEM WHEREINSYMBOLS ARE REPRESENTED BY A SINGLE ELECTRICAL SIGNAL COMPRISING AMULTIPLICITY OF SEQUENTIAL INTRASIGNAL PULSE UNITS AND INCLUDINGINITIATING START AND TERMINATING STOP PULSE UNITS WITH A MULTIPLICITY OFINTERMEDIATE SEQUENTIAL PULSE UNITS EQUAL IN NUMBER TO A PREDETERMINEDNUMBER OF BLOCKS CONSTITUTING A GRID BLOCK ARRANGEMENT OF A SYMBOLENCOMPASSING RECTANGULAR SPACE, EACH SPECIFIC SYMBOL TO BE TRANSMITTEDCOMPRISING A PREDETERMINED ORDER OF DISTINCT ELECTRICAL VALUE PULSEUNITS CORRESPONDING TO SPECIFIC GRID BLOCK LOCATIONS IN THE SYMBOLRECTANGULAR SPACE WHICH, WHEN VISUALLY REPRODUCED IN A SYMBOL RECTANGLESPACE ON A RECORD MEDIUM, WILL DEPICT THE SPECIFIC SYMBOL; SAIDRECEIVING RECORDING UNIT COMPRISING: (A) MEANS FOR RECEIVING SAIDSIGNAL; (B) MEANS FOR RECORDING, BY PROGRESSIVE TRANSCRIPTION PRINTING,THE SYMBOL REPRESENTED BY SAID MULTIPLICITY OF INTERMEDIATE INTRA-SIGNALPULSE UNITS OF SAID SIGNAL INCLUDING (1) MEANS ACTUATED BY THE RECEIVINGMEANS FOR CAUSING THE INITIAL PULSE UNITS OF SAID SYMBOL SIGNAL TO STARTTHE RECORDING MEANS; AND (C) MEANS COMPRISING PORTIONS OF SAID RECEIVINGMEANS AND PORTIONS OF SAID RECORDING MEANS AND RESPONSIVE TO SAIDTERMINATING PULSE UNITS FOR STOPPING SAID RECORDING MEANS AFTER EACHSYMBOL RECORDATION SO THAT THE BEGINNING OF THE RECORDATION OF THESUBSEQUENT RECEIVED SYMBOL REPRESENTING SIGNAL OF AT LEAST TWOSUCCESSIVE SUCH SIGNALS WILL BEGIN AT A UNIFORM DISTANCE FROM THETERMINAL POINT OF THE RECTANGULAR SPACE FOR THE PRECEDING RECORDEDSYMBOL.